Alexander walker



(No Model.)

A. WALKER.

POST DRILL FRAME.

No. 463,469. Patented Nov. 17, 1891.

mwzeior UNirEn STATES PATENT OFFICE.

ALEXANDER \VALKER, OF HAT CHEER, IOXVA, ASSIGNOR OF TiVO-THIRDS 7 TO THOMAS THOMPSON AND VILLIAM THOMPSON, BOTH OF SAME PLACE.

POST-DRILL FRAME.

' SPECIFICATION forming part of Letters Patent No. 463,469, dated November 17,1891.

Application filed July 7, 1891. Serial No. 898,715. (No model.)

To aZZ whom it may concern.-

Be it known that I, ALEXANDER WALKER, a citizen of the United States, residing at \Vhat Cheer, in the county of Keokuk and State of Iowa, have invented-new and useful Improvements in Post-Drill Frames, of which the following is a specification. My invention relates to that type of drilling apparatus used in coal and other mines -10 for boring or drilling the holes for blastcharges and other purposes.

It ismy purpose to provide a drill-post or drill-frame which shall be light and portable, which may be set up in any position or at any angle, and by which the drill may be operated in any direction, and in which great, strength shall be combined with a light and simple construction.

It is my purpose, also, to provide a mining 2o mechanism consisting of a'post-drill frame having separately-formed plates provided with recesses or seats for the trunnions of the gear-box, so formed that the latter shall be securely retained and provided with ample and secure support in any one of the positions to which the drill may be adjusted, but shall also be readily removable from said seats or recesses if necessary. It is a further purpose of my said invention 0 to provide a drill-frame or drill-post in which the seats for the trunnions of the gear-box shall be formed in plates cast or otherwise formed separately in such form that when united with the frame said plates shall be 3 5 supported in such manner as to give the structure increased strength with less weight of metal and with a lighter and more simple construction than has heretofore been used.

The invention consists, to these ends, in the 40 several novel features of construction and new combinations and parts hereinafter fully set forth, and then more particularly pointed out and defined in the claims concluding this specification.

To enable others skilled in the art to which my invention pertains to make and use the same, I will now proceed to describe said in vention in detail, reference being had for such purpose to the drawings accompanying this specification, in which- Figure l is a perspective View of the drillframe in position for operation. Fig, 2 is a transverse section of the frame, showing the method of uniting the trunnion-supporting plates therewith. Fig. 3 is a detail face elevation of a portion of one of the trunnionplates, showing the form of the seats or recesses for the trunnions of the gear-box. Fig.

4 is an elevation of the top of the gear-box, the drill being removed. Fig. 5 is an end ele- 6o vation of the drill-frame, showing the manner of uniting the side bars. 7

The reference-numeral 1 in said drawings indicates the side bars of the drill frame or post, which are formed of flat plates of metal of suitable length and having the proper thickness and width to impart the required strength andrigidityunder the maximum strains which may be imposed-thereon. At their upper ends the side bars are united by an end casting, which consists of a central cylindrical sleeve 2, having its axis parallel with the side bars and provided upon opposite sides with thick integral webs 3, terminating upon their outer edges in T-heads 4, having low flanges 5 upon their edges, said flanges being adapted to overlap the'edges of the side bars 1 to assist in maintaining the parts in position. The end casting is secured to the side bars by strong screw-bolts 6, tapped into the Webs 3 and passing through openings in the side bars. Upon one side of the sleeve '2, which forms a box for an extension-pipe 7, is cast a boss or nipple 8, having a central threaded opening which receives a tailset-screw 9, by which the extension-pipe is locked at any point towhich it is adjusted. The part last mentioned con sists of a cylinder or shell open at one end and hollow throughout its cylindrical body to give less weight without materially decreasing its strength. Its end, which projects above the end casting, is of substantiallyconical form, being tapered to apoint to enable it to enter or engage with the coal or rock. At their lower ends the side bars are connected by an end casting similar in all material respects to the one described, and differing therefrom only in the provision of a female thread in the central sleeve or box, which receives a jack-screw 10, having a'pointed end 12 and provided with a lever l3,longitudinally movable in a transverse aperture formed in the solid shank of the screw between its point and the threaded portion. The end casting last mentioned is secured to the side bars at their lower ends by screw-bolts 14, similar to those used at the upper ends of said bars.

The reference-mnneral 15 designates the trunnion-supporting plates, which are usually formed of malleable cast-iron. Each plate consists of a comparatively thin strip of metal having a length somewhat less than the distance between the end castings, their width being preferably a little less than that of the side bars of the dri1l-post. The outer faces of these plates are flat to enable them to rest; against the inner surfaces of the side bars, and upon one edge each bar is provided with a flange 16, which forms a right angle with the plate or thereabout. These flanges, when the plates are in position upon the frame, rest upon those edges of the side bars which are adjacent to or face toward the point where the drill is to operate. The trunnion-supporting plates are fastened to the side bars by means of rivets 17, passing through the openings in said plates and through similar openings in the side bars at suitable intervals.

Upon the inner faces of the trunnion-supporting plates 15 are formed a series of seats or recesses 19, which receive the trunnion pins or journals of the gearbox. I form these seats ordinarily by casting upon each plate a strong web or flange 20 of a form approximating that of the seats or recesses. Each of the latter has substantially the form of an ellipse or the outline of an oblate spheroid, which has been truncated between its center and one end of its minor axis. By such construction the trunnion-pins will be retained securely therein when there is no back-pressure 011 the drill, and the latter may be operated in any direction without danger of displacing the trunnion pins, which may be removed readily through openings 21, which are of less width than the major axes of the interior seats. These openings are formed upon the sides adjacentto the flanges 16,in order that the back-pressure of the drill may be sustained in part by said flanges, and thus removed partially from the rivets 17..

The drill, which is provided with a threaded shank in the usual manner, is mounted in a gear-box composed of two separable members 22 and 23, having butts flat and 25, respectively, and connected by a pintle 26, driven into openings in said lugs. The interior of each part or half member of said box is provided with a half round or semicircular threaded seat or recess to receive and embrace the threaded shank or thread-bar of the drill. Upon one of the parts of the box are formed lugs 27, projecting from thefree edge, an opening or space being formed between said lugs, which receives a stud 2% on the flat face of the other half of the box, an aperture being provided therein to receive a splitkey, which rests upon the lugs 27 and locks the parts when closed. The trunnion-pins orjournals 29 are cast upon the opposite outer edges of the part 22.

Upon one end of the half-box or part 22 is formed an integral laterally-projecting arm or bracket 30, lying at a suitable angle with the threaded opening in the box. Upon the end of this arm is formed a sleeve-bearing or' cylindrical box 31, having its axis at right angles with the axis of the drill, or substantially so, to enable it to receive the journal of a small bevel-gear 33, which meshes with a larger bevelgear 3t, which is splined upon the thread-bar 85. A crank 36 is fitted upon the squared end of the journal 32 in any suitable manner.

By my construction the thrust of the drill is sustained at points close to and almost in the same plane with the flanges 16, by which it is resisted, and all torsional strain is avoided. I am able, also, for this reason to use very light rivets in attaching the plates 15 to the drill'frame and to very materially decrease the bulk and weight of the structure and at the same time secure greater strength of resistance, while the irregular ribs 20 strengthen the trunnion-supporting plates and constitute bearings for the trunnion-pins of the gearbox.

"What I claim is- 1. In a post-drill, the combination, with the side bars of the drill-frame, of flat trunnionsupporting plates separately formed and connected to the side bars of the frame by flanges formed upon the edges of the trunnion-supporting plates and resting upon the edges of the side bars to sustain the back-thrust of the drill, said plates being provided upon their flat inner faces with laterally-projecting irregular strengthening-ribs having curved portions which form seats or recesses for the trunnions of the gear-box, substantially as described.

2. In apost-dri1l, the combination, with side bars consisting of flat parallel metallic plates connected at their ends, of separately-constructed trunnion-supporting, devices consisting of comparatively thin flat plates of metal lying against the inner flat faces of the side bars and provided with flanges which are turned outward over the front edges of said side bars, said plates being formed integral upon their inner faces with laterally-projecting irregular strengthening ribs having curved portions which form seats or recesses for the trunnion pins or journals of the gearbox, substantially as described.

3. In apost'drill, the combination, with the side bars 1 of the drill-frame, of the flat trunnion-supporting plates 15, riveted to the side bars and each having a laterally-projecting strengthening-rib having curved portions at regular intervals to form pockets 0r seats 19,

the edge of each of which is uniformly curved In testimony whereof I have hereunto set and contracted atits receiving-mouth 21, said my hand and aflixed my seal in presence of [o supporting-plates having lateral flanges 16 two subscribing Witnesses.

alon one lon 'itudinal ed e'which overlap 7 Y T 7 4 and bear agai nst longitudinal edges of the ALEXALDER XVALIXLR' side bars, and a gear-box having trunnion- Witnesses: pins arranged in the pockets or seats, sub- J. O. BEEM,

stantiaiiy as described. JAS. DAVISON. 

